Caliper adjustment



(No'ModL) A MUNC H GALIPER ADJUSTMENT.

No; 441,685. Patented 1300. 2, 1890.

I leg A'.

UNITED STATES PATENT O FI ARTHUR MUNCH, OF MILXVAUKEE, YVISCONSIN.

CALI'PER ADJ USTM ENT.

SPECIPICATION forming part of Letters Patent No. 441,(385, dated December 2, 1890.

Application filed August 21, 1890.

To all whom, it may conccrn:

Be it known that LARTHUR MUNCH, of Milwaukee,in the-countyof Milwaukee and State of Wisconsin, have invented a new and useful Improvement in Calipers, of which the fo1- lowing is a description, reference being had to the accompanying drawings, which are a part of this specification.

The object of myinvention is to enable the user to obtain nice adjustments of the device and also to adapt it for obtaining a desired measurement of a part of an article beyonda larger or smaller part of the same article by means of a prearranged adjustment ot' the calipers.

In the drawings, Figure 1 is an elevation of the conplete device. Fig. 2 is an edge elevation of the same device. Fig. 3 is an enlarged view of a portion of the device, parts being broken away to show interier construction. Fi'. 4: is a transvcrse section on line 4 4 of Fig. Fig. 5 is a modified form of the device.

The legs A A' of the calpers are hinged together alongside each other by a pivot B. A thin Washer C is preferably interposed between the two legs about the pivot B. An adjusting-bar D is also pivoted mediallyon the pivot B. A Washer E is preferably interposed between the bar D and the adjacent leg of the calipers, and another Washer F is preferably placed about the pivot B on the outside of the For securing the parts to each other movably the pivot B is countersunk in the bar D and in the Washer F.

In construoting the device small channels or notches are made in the leg A' of the calipers, and the parts of the pivot B in upsetting it or rivetin it in its seat are forced into the notches in the leg, forming little projections or keys G G, which secure the pivot B to the leg A' so that the twohave concnrrent rotary movement. The outer arm of the bar D is split lon gitudinally, forming two parallcl parts H H, which normally are alittle distance from each other, the outer longitudinal edges of which are slightly beveled inwardly toward their free ends and are screw-threaded. A winged cap-shaped nut I is adapted to draw the partis I-l H together, clamping the bar Serial No. 362 579. (No model.)

tightly on the pivot B, and by reason of the beveled form of the aperture through the bar in which the countersunk end of the pivot B is inserted is also adapted to force the bar D tightly against the Washer E, thus taking up any possible wear or play in the joints of the device. A small headed screw K is j ournaled so as to prevent endwise movement in a post L, swiveled in the leg A. The screw K enters and turns by its thread in a post M, swiveled in the inner end of the bar D. It Will be un derstood that the screw K by turning in the post M is adapted to nove the leg A toward and from the bar D, and as a consequence toward and from the leg A'.

In use the nut I is turned off the barD sufficiently to allow the legs to Swing freely toward andfrom each other, and when the points of the legs are arranged approximately at the distance apart desired the nut I is turned down firnlyon the bar D, Whereby the bar and the legs are clampedwith considerable firnness to each other, and thereafter the free ends of the legs are adjusted at the exact distance from each other desired by turning the screw K in the post M, as before suggested.

In the modified form of device slownin Fig. 5 the points of the legs N N' are turned outwardly, thus adapting theni nore especially for inside measurements. o The other parts of the device are the samein form and Construction as in the device shown in Fig. 1.

The parts of the device in Fig. 5 are arranged with reference to each other to show another and convenient use ot' the calipers. The screw K being removed from the post M and the bar D being swung around so as to be on the outside of the post L, the device is adapted to be used as follows: The legs may be swung apart so as to indicate a desired measurement, and the bar D,being then swung up to and against the post L, is clamped in position by turning the nut I down thereon, so that the parts of the device are held together with eousiderable firmness, and thereafter the 9 legs N N' may be swung toward each other, so that their points can enter a small aperture, the bar D in the meantime remaining with reference to the leg N' in the positionin which it is set, and thereupon the legs N N' IOO may he again swung &part until the post L shall come in contact with the bar D, thus readjusting it at the desh-ed angie.

`What I claim as new, and desire to secure by Letters Patent, is-

1. In a calipers, the combination, with the two legs hinged together on apivot, of an adjusting-bar `hinged on the same pivot and a screw journaied in a post swiveled in one of the legs'and turning into a post swiveled on the ba r, substantally as described.

2. In' a. calipers, an adjusting-screw, as K, journaied in a post, as L, swiveled in a leg of the calipe's and turning by its thread into a post, as M, swiveled in an adjnsting-bar, substantialiy as described.

3. In a calipers, the combination, with the two legs hinge on a common pivot, of an adj Listing-bar D, hinged on the same pivotat the side of one of the legs, the pivot having a` beveied end which is counte'sunk in the bar, one end of the bar being split from the pivot outwztrdly, and zt nut turning on the screwthreaded tapering split end of the bar, substantially as described.

4. In a oalipers, the conbination, with the two legshinged alongside each other ou a pivot, of an adjusting-bar hinged on the same pivot, which bar is split at one end and is pro- Video'. with a screw-threaded nut tn'ning on the tapering split end, and a screw journaled in a post on one of the legs of the calipers and turning in a post swiveled in the adjustingbar, substantially as described.

In testimony whereof I afiix my signature in 35 presence of two witnesses.

ARTHUR MUNCH.

XVitnesses:

C. T. BENEDICT, ANNA FAUST. 

